10min:
LINE INTENSITY MEASUREMENTS IN 14N216O AND THEIR TREATMENT USING THE EFFECTIVE OPERATOR APPROACH. II. THE 5200 TO 6400 CM-1 REGION.

J. VANDER AUWERA, Laboratoire de Chimie Physique Moléculaire C. P. 160/09, Université Libre de Bruxelles, 50 Avenue F. D. Roosevelt, B-1050 Brussels, Belgium; L. DAUMONT, Groupe de Spectrométrie Moléculaire et Atmosphérique, ESA CNRS 6089, Université de Reims, Faculté des Sciences, Moulin de la Housse, BP 1039, F-51687 Reims cedex 2, France; V. I. PEREVALOV, S. A. TASHKUN, Institute of Atmospheric Optics, Russian Academy of Sciences, Siberian Branch, 1 Akademicheskii Avenue, 634055 Tomsk, Russia; J-L. TEFFO, Laboratoire de Physique Moléculaire et Applications, CNRS, boîte 76, Université Pierre et Marie Curie, 4 Place Jussieu, F-75252 Paris, France.

This work continues a series of publications devoted to the application of the effective operators approach to the analysis and prediction of vibration-rotation spectra of linear triatomic molecules. In that frame, the present work aims at describing line intensities of cold and hot bands of 14N216O in its ground electronic state in the spectral range above 3600 cm-1. In N2O, vibrational interacting levels group in polyads, identified by the so-called polyad number P = 2V1 + V2 + 4V3, as a result of the relation 2 omega1 sim 4 omega2 sim omega3 existing between the harmonic frequencies.

The absorption spectra of N2O, at room temperature, have been recorded in Brussels over the whole range between 3600 and 11000 cm-1 using a Bruker IFS120HR Fourier transform spectrometer. The measurement and analysis of absolute line intensities in the region between 4300 and 5200 cm-1, involving bands associated with transitions corresponding to Delta P = 7, 8 and 9, was done recently. We are now measuring absolute line intensities for cold and hot bands associated with transitions corresponding to Delta P = 10 and 11, observed in the range from 5200 to 6400 cm-1. Using wavefunctions previously determined from a global fit of an effective hamiltonian to about 18000 line positions, parameters of a corresponding effective dipole moment are then fitted to these experimental intensities. Results will be presented and discussed.